Blow-off cock.



' W. W. HOFFMAN.

BLOW-OFF 000K. APPLICATION FILED JAN. 2, 1912.

Patented July 2, 1912.

f. w @difi fi-mvq /f/im IV] T N155 S E S Brow-oar coon.

' Application filed January 2, 1312f To all whom it may concern: Be it known that I, WALL cn Horr- MAN, citizen of the United States, residing at J anesville, in the county of Rock and State of Wisconsin, have invented new and useful Improvements in Blow-01f Cocks, of. which the following is a specification.

My present invention pertains to blowofi cooks for boilers; and it has for one of its objects to provide a, simple, inexpensive and reliable b ow-oif cock which embodies no parts that are likely vto get out of order after ashort period of pee, and is easy to operate.

Another object of the invention is the provision of'nieans for positively closing the valve in the event of the same becoming fixed in any manner in an open position.- Otherobjects and advantageous features of the invention will be fully understood from the following description and claims when the same are read in .conne: tioi"; with the drawings, accompanying and forming. part of this specification, in which the figure is a view, partly in section and partly in elevation, illustratingthe best practical embodiment of my invention that I have as 'yet' devised.

My novel blow-off cock comprises 'a casing section A that is interiorly threaded at its opposite ends, .and receives in one of said threaded ends an exteriorly threaded nipple B, of brass. This latter extends a material distance beyond'the adjacent end of the casing section A, and is designed to form a seat:

for a valve body C, integral with or fixed to a ster n'D. It will also be observed that the casing section A is provided .nits side withan oiitlet E..

In the opposite end of, the casing section A, with reference to the brass nipple- B, is

threaded a head F, a-nd in the said head F,

. which is apertured for the passage of the stem D, is threaded in-turn a packing nut G that is preferably .of brass. The head F 'is provided with a bifurcated arm H,' and, in the said arm is fulcrumed a lever I,,one

arm a of which is opposed to the outer end of the valve stem D. Th the lever I is provided for the connection of a cable (not shown) and it will be readily understood that when the; said cable is pulled the valve body Q, wh ch is normally held against the brass nipple B by the\pressure in aboiler, will be opened againstthe said PI'QSSULG. at this point I would have N $pecif cation of Letters Patent. 7

- said casing J and a boiler.

other arm I) of.

Serial No. 658,881,

it understood that iwithout involving departure from the, scope of inyfinventionflhe nipple B or rather the portion thereof'tliafi extends beyond the casingsection A, "maybe screwed directly into a boiler wall, in which j event the valve body C would bepositioned within the boiler. I prefer, however, to posit-ion both the extended'portion of the "nipple B and the valve body C in a casing section J, which casing section J is provided witha threaded aperture K 'designed' to receive a short section of pipe L through which connection is reflected-between the Threaded in the opp'ositeend of the'ica'sg ing section J, with reference to'theibrass nipple B, isva head M provided with alongi tudinal-central threaded aperture'fmi enti e,

stufing box n, and threaded'inth'esaid head- 7 and extending through said stufiing boxis a rod Rg 'llhestiid rod P is provided at-its inner end with a body 7;, opposed to-a pro tuberance r'on thevalve body andatjts outer end the rod- P is "provided wan s handle .9.

" So long as the valve C operates, the rod? v p is allowed to remain' in-the idle position shown. When, however, the valve or valve body 0' sticks because of any condition in an open position,.the rod P is turned'inward through the head M, whereupon the head 17 on the red by acting against the protuber- 'ance 1" of the valve body C,- will effectually,

release and close the said valve body against the seat afiorded by thenipple B.

It will "be gathered from the foregoing that my novel blONr'Off cock is simple, inexpensive and durable; also, that the valve body G which is preferably of steel is designed to be tightly held by the pressure in the boiler against the seat afiorded'by. the brass nipple B,.and in such manner that leakage'past the closed valve willbe pre clnded.. I Obviously the casing sections, the heads,

and the lever I embodied in the. coclqnxay be of cast-metal with a view-ofcontributing to the 'cheapness of. the cock, I

It will further be appreciated from the foregoing that because of thenrelative'arrangernentof the valve body Uand the brass nipple B to-th'e boiler'conn'ection, there is 4, no liability of the valve being fixed in positionby freezing, and hence at all times the 110 valve body may be eas lyrnoved away from the brass nipple to establish communication Patented aa a 'aia l the interior of the boiler and thej claim and desire outlet E. s V

. 'Having described my invention, "what I to secure by Letters-Patcut, is: l I

1 A blow -off ock comprising .21 casing section, a nipple of comparatively soft metal,-

as brass, fixed to and extending beyond one end of theeasing section and having its extended portion exteriorly threade'dfmeans closing the opposite end-of the casing 'sec' tion, with referenceto the brass 'nipple, a

valve body, of comparatively liar'd'met'al,

opposed: to the endof the nipple remote fronrthe casing section, and a stem fixed with respect to the valve bod and extending through the saidmeans at tie'opposite end of the casing section.

' 2; A blow-0E cockcomprising acasing section, a nipple of'comp'arativcly soft metal, as brass, fixed to' and extending beyond one end of the casingsectionand having its extended portion exteriorly threaded, means. closing the opposite end of the casing section, with reference to the brass nipple, 'a valve body of comparatively hardmetal, as iron or steel, opposed to the end of the nipple.

remote from the casing section, a stem fixed with respect to the valve body and extending.

through the said means at the opposite end of the casing section; the said casing section beingprovided with an outlet, a second casing' section threaded on the extended portion of the'nipple and inclosing the valve body and equipped withmeans for connection to a boiler, means closing the outer end of the second-named casing section, and

means movable endwise through said closure --means and having a head disposed in the second-named casing section and opposed to the-valve body.

3. The herein described blow-ofi cock comprising an exteriorly' threaded nipple of comparatively softrnetal, as brass, casing with the boiler connection, a stem fixed with respect to the valve body and extending through the closure means at the outer end of the easlng section that is provided with the outlet, and a lever fulcruined on said closure means and having an arm opposed. to the outer end of the valve stem.

Intestimony whereof I have hereunto set my hand in presence of two subscribing Wit nesses.

WALLACE W. HQFFMAN,

.Vitnesses N. L. DTODDARD, CHARLES L. .MANxINe. 

